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Speedmaster Cast Aluminum Cylinder Head Big Block Mopar 383/440 w/Hydraulic Flat Tappet Cam

746-PCE281.2140


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Cast Aluminum Cylinder Head Big Block Mopar 383/440 w/Hydraulic Flat Tappet Cam
$1,515.00
5 left in stock
Cast Aluminum Cylinder Head
  • Big Block Mopar 383/440 w/Hydraulic Flat Tappet Cam
  • Assembled Head
  • 74cc Combustion Chamber
  • 265cc Intake Runner
  • Includes Valves & Springs
  • Set of 2
  • Free Shipping - Ships
    QTY

    PCE281.2140 is rated 1.0 out of 5 by 3.
    Rated 1 out of 5 by from I have had the motor together but can’t find pushrods. First set of rockers were wrong and pushrods were wrong. Then new rockers were right wrong pushrods. Now i have measured pushrods and can’t find the right ones. Plus the valley tray I finally had to build my own as well pain in the butt
    Date published: 2023-12-05
    Rated 1 out of 5 by from Worst machine work on the market I purchased a set of these heads and had to do a lot of material removal for pushrod clearance. On top of that they require a .750 to .800 offset rocker to run a 3/8 pushrod. After that they had to be ripped down and re lap the calves cause they where not done right. After the break in and dyno tune with engine in the car a valve broke and ruined the entire engine. The heads have been sent in and welded re milled and all Manley valves on my new build. In the end these heads cost me almost 10k because of the failure and building another engine. Please do not run these with the hardware they are built with or you are really taking a gamble.
    Date published: 2020-04-12
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    will stock rocker shafts and rockers work with these heads?

    Asked by: Robd440
    The Speedmaster 746-PCE281.2140 cylinder head requires offset rockers.
    Answered by: jshook
    Date published: 2024-01-26

    What's the port size so I can pick a intake manifold to match the best I can out what would be recommended

    Asked by: Knisha
    The Speedmaster 746-PCE281.2140 cylinder head has port sizes measuring 2.23 x 1.185.
    Answered by: jshook
    Date published: 2023-03-09

    Do these require offset rocker arms

    Asked by: Craig440
    Yes, these are the recommended rocker arms - https://www.jegs.com/i/Speedmaster/746/1-261-026/10002/-1
    Answered by: Rusty B
    Date published: 2023-01-14

    Will the bear cast heads ( not cnc ) capable of making 500 to 550 hp with 10.51 compression with a 600 lift cam and a 850 carb

    Asked by: Ronalda
    Yes, with the right accessories this would be capable of making 500 hp.
    Answered by: Rusty B
    Date published: 2018-09-25

    Is it possible to get 11 to 1 compression using Wesco flat top pistons by Milling the heads

    Asked by: Ronalda
    We offer a number of pistons that will be around 11:1 without milling these heads.
    Answered by: Rusty B
    Date published: 2018-09-10

    What is the compression using flat top Wesco Pistons

    Asked by: Ronalda
    The compression when using a Wiseco flat top piston with this cylinder head will be approximately 10.2:1
    Answered by: Rusty B
    Date published: 2018-09-08

    What would the compression ratio be with flat top pistons with these heads

    Asked by: Ronalda
    We would need to know what pistons you were using.
    Answered by: Rusty B
    Date published: 2018-08-29

    What is the max horsepower these heads will make

    Asked by: Ronalda
    Many factors involved in that, these will make at least 750 hp in the right installation.
    Answered by: Rusty B
    Date published: 2018-09-05
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